Termux gcc compile-CodePudding

Currently I am learning C language in termux When i try to compile a simple code of pointers using gcc pointer.c
The code is

#include <stdio.h>

int main(){


 int a=57;

 printf("The value of a is %d \n",a);
   printf("The address of a is %u\n",&a);



return 0;

}

Then I got this error (actually warning) as shown in the image enter image description here

But i see that it compiled my code and it successfully running as shown in the image enter image description here

I want to know why it gives error

CodePudding user response：

You should use %p instead of %u to display pointer address. Your code will be:

#include <stdio.h>
int main()
{
 int a=57;
 printf("The value of a is %d \n",a);
 printf("The address of a is %p\n",&a);
 return 0;
}

CodePudding user response：

#include <stdio.h>
    int main()
    {
     int a=57;
     printf("The value of a is %d \n",a);
     printf("The address of a is %p\n",(void*)&a);
     return 0;
    }

The address of a variable is an integer numeric quantity and the format specifier used to print such a quantity is %p (for printing address in hexadecimal form) and %lld (for printing address in decimal form). To print the address of a variable, we use & along with the variable name.The %p specifier expects a void*.